Condensed cyclic compound and organic light-emitting device comprising the same

ABSTRACT

An organic light-emitting device including a first electrode as an anode; a second electrode as a cathode and facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, a hole transport region between the first electrode and the emission layer, and an electron transport region between the emission layer and the second electrode, where at least one selected from the emission layer and the electron transport region includes at least one selected from condensed cyclic compounds represented by Formula 1:
 
A 2 -(A 1 ) n1 .  Formula 1

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2015-0040211, filed on Mar. 23, 2015, in the KoreanIntellectual Property Office, the entire content of which isincorporated herein by reference.

BACKGROUND

1. Field

One or more aspects of embodiments of the present disclosure relate to acondensed cyclic compound and an organic light-emitting device includingthe same.

2. Description of the Related Art

Organic light-emitting devices (OLEDs) are self-emitting devices thathave advantages such as wide viewing angles, excellent contrast, quickresponse, high brightness, excellent driving voltage characteristics,and can provide multicolored images.

An organic light-emitting device may have a structure in which a firstelectrode, a hole transport region, an emission layer, an electrontransport region, and a second electrode are sequentially positioned inthis order on a substrate. Holes injected from the first electrode moveto the emission layer via the hole transport region, while electronsinjected from the second electrode move to the emission layer via theelectron transport region. Carriers such as holes and electrons thenrecombine in the emission layer to generate excitons. When the excitonsdrop from an excited state to a ground state, light is emitted.

SUMMARY

One or more aspects of embodiments of the present disclosure aredirected to a novel condensed cyclic compound and an organiclight-emitting device including the same.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

According to one or more embodiments of the present disclosure, acondensed cyclic compound is represented by Formula 1:A₂-(A₁)_(n1),  Formula 1

wherein, in Formula 1,

A₂ may be selected from groups represented by Formulae 2A to 2E;

A₁ may be selected from groups represented by Formulae 2-1 to 2-4; and

n1 may be an integer selected from 1 to 5, wherein, when n1 is 2 orgreater, at least two A₁s may be the same as or different from eachother:

wherein,

X₁ and X₂ in Formulae 2A to 2E and Formulae 2-11 to 2-17 may be eachindependently O or S;

R₁ to R₁₂ in Formulae 2A to 2E may be each independently selected from abinding site to A₁ in Formula 1, hydrogen, deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a substituted or unsubstitutedC₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group,a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group (e.g., a substituted or unsubstituted monovalentnon-aromatic condensed polycyclic group), a substituted or unsubstitutedmonovalent non-aromatic condensed heteropolycyclic group (e.g.,substituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group), —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇);

R₁ to R₁₂ in Formulae 2A to 2E may each independently be a binding siteto A₁ in Formula 1, where at least one selected from R₁ to R₁₂ is abinding site to A₁ and the number of binding sites is equal to n1 inFormula 1;

L₁ to L₁₀ in Formulae 2-1 to 2-4 may each independently be selected froma substituted or unsubstituted C₃-C₁₀ cycloalkylene group, a substitutedor unsubstituted C₁-C₁₀ heterocycloalkylene group, a substituted orunsubstituted C₃-C₁₀ cycloalkenylene group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₁-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic condensed heteropolycyclic group;

a1 to a10 in Formulae 2-1 to 2-4 may be each independently an integerselected from 0 to 5;

Ar₁ to Ar₆ in Formulae 2-1 to 2-4 may each independently be selectedfrom groups represented by Formulae 2-11 to 2-17, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group;

b1 to b4 in Formulae 2-1 to 2-4 may be each independently an integerselected from 1 to 5;

R₂₁ and R₂₂ in Formulae 2-11 to 2-17 may each independently be hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇);

c1 in Formulae 2-11 to 2-17 may be an integer selected from 0 to 5; and

c2 in Formulae 2-11 to 2-17 may be an integer selected from 0 to 6,

wherein at least one selected from substituents of the substitutedC₃-C₁₀ cycloalkylene group, the substituted C₁-C₁₀ heterocycloalkylenegroup, the substituted C₃-C₁₀ cycloalkenylene group, the substitutedC₁-C₁₀ heterocycloalkenylene group, the substituted C₆-C₆₀ arylenegroup, the substituted C₁-C₆₀ heteroarylene group, the substituteddivalent non-aromatic condensed polycyclic group, the substituteddivalent non-aromatic condensed heteropolycyclic group, the substitutedC₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group, thesubstituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxy group,the substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀arylthio group, the substituted C₁-C₆₀ heteroaryl group, the substitutedmonovalent non-aromatic condensed polycyclic group, and the substitutedmonovalent non-aromatic condensed heteropolycyclic group may be selectedfrom:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group,

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group (e.g., aryloxy), C₆-C₆₀ arylthio group(e.g., arylthio), C₁-C₆₀ heteroaryl group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group,

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),—Si(Q₂₃)(Q₂₄)(Q₂₅), —B(Q₂₆)(Q₂₇), and —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅),and —B(Q₃₆)(Q₃₇),

wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ may eachindependently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group.

According to one or more embodiments of the present disclosure, anorganic light-emitting device includes: a first electrode; a secondelectrode facing the first electrode; and an organic layer between thefirst electrode and the second electrode, the organic layer including anemission layer, wherein the organic layer includes at least onecondensed cyclic compound as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings in which:

FIGS. 1 to 4 are schematic views of organic light-emitting devicesaccording to embodiments of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in more detail to embodiments, examples ofwhich are illustrated in the accompanying drawings, wherein likereference numerals refer to like elements throughout. In this regard,the present embodiments may have different forms and should not beconstrued as being limited to the descriptions set forth herein.Accordingly, the embodiments are merely described below, by referring tothe figures, to explain aspects of the present description. As usedherein, the term “and/or” includes any and all combinations of one ormore of the associated listed items. Expressions such as “at least oneselected from” and “one selected from,” when preceding a list ofelements, modify the entire list of elements and do not modify theindividual elements of the list. Further, the use of “may” whendescribing embodiments of the present invention refers to “one or moreembodiments of the present invention.”

According to an embodiment of the present disclosure, there is provideda condensed cyclic compound represented by Formula 1:A₂-(A₁)_(n1).  Formula 1

In Formula 1,

A₂ may be selected from groups represented by Formulae 2A to 2E;

A₁ may be selected from groups represented by Formulae 2-1 to 2-4; and

n1 may be an integer selected from 1 to 5, and when n1 is 2 or greater,at least two A₁s may be the same as or different from each other.

In Formulae 2A to 2E, X₁ may be oxygen (O) or sulfur (S).

In some embodiments, X₁ in Formulae 2A to 2E may be 0.

In Formulae 2A to 2E, R₁ to R₁₂ may be each independently selected froma binding site to A₁ in Formula 1 (e.g., a chemical bond such as asingle bond coupled to A₁ in Formula 1), hydrogen, deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid group or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a substituted or unsubstitutedC₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group,a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and—B(Q₆)(Q₇), where Q₁ to Q₇ may each independently be selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, and amonovalent non-aromatic condensed heteropolycyclic group.

For example, in Formulae 2A to 2E, R₁ to R₁₂ may be each independentlyselected from:

a binding site to A₁ in Formula 1 (e.g., a chemical bond such as asingle bond coupled to A₁ in Formula 1);

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof and a phosphoric acidgroup or a salt thereof;

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group;

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅); and

—Si(Q₃)(Q₄)(Q₅),

where Q₃ to Q₅ and Q₃₃ to Q₃₅ may be each independently selected from aC₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group.

In some embodiments, in Formulae 2A to 2E, R₁ to R₁₂ may be eachindependently selected from:

a binding site to A₁ in Formula 1 (e.g., a chemical bond such as asingle bond coupled to A₁ in Formula 1);

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, an imidazopyridinyl group, and animidazopyrimidinyl group;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, an imidazopyridinyl group, and animidazopyrimidinyl group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅); and—Si(Q₃)(Q₄)(Q₅),

where Q₃ to Q₅ and Q₃₃ to Q₃₅ may be each independently selected from aC₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group. However, embodiments of the present disclosure are notlimited thereto.

In some other embodiments, in Formulae 2A to 2E, R₁ to R₁₂ may be eachindependently selected from a binding site to A₁ in Formula 1 (e.g., achemical bond such as a single bond coupled to A₁ in Formula 1),hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, groups represented byFormulae 5-1 to 5-75 (for example, groups represented by Formulae 6-1 to6-43 and/or Formulae 10-1 to 10-117), and —Si(Q₃)(Q₄)(Q₅), where Q₃ toQ₅ may be each independently selected from a C₁-C₁₀ alkyl group, aC₁-C₁₀ alkoxy group, a phenyl group, and a naphthyl group. However,embodiments of the present disclosure are not limited thereto.

In Formulae 5-1 to 5-75,

Y₃₁ may be selected from O, S, C(Z₃₃)(Z₃₄), N(Z₃₅), and Si(Z₃₆)(Z₃₇),

Z₃₁ to Z₃₇ may be each independently selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamino group, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, a biphenyl group, a terphenylgroup, and —Si(Q₃₃)(Q₃₄)(Q₃₅), where Q₃₃ to Q₃₅ may be eachindependently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group,a phenyl group, and a naphthyl group,

e2 may be an integer selected from 1 and 2,

e3 may be an integer selected from 1 to 3,

e4 may be an integer selected from 1 to 4,

e5 may be an integer selected from 1 to 5,

e6 may be an integer selected from 1 to 6,

e7 may be an integer selected from 1 to 7,

e8 may be an integer selected from 1 to 8,

e9 may be an integer selected from 1 to 9, and

* may be a binding site with an adjacent atom.

In Formulae 6-1 to 6-43 and Formulae 10-1 to 10-117, * is a binding sitewith an adjacent atom.

In some embodiments, in Formulae 2A to 2E, R₁ to R₁₂ may be eachindependently selected from a binding site to A₁ in Formula 1 (e.g., achemical bond such as a single bond coupled to A₁ in Formula 1),hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, and a C₁-C₁₀ alkoxy group. However, embodiments ofthe present disclosure are not limited thereto.

In Formulae 2A to 2E, R₁ to R₁₂ may each independently be a binding siteto A₁ in Formula 1, where at least one selected from R₁ to R₁₂ is abinding site to A₁ and the number of binding sites is equal to n1 inFormula 1.

In Formula 1, n1 may be an integer selected from 1 to 5. In someembodiments, n1 in Formula 1 may be 1 or 2. For example, n1 in Formula 1may be 1. However, embodiments of the present disclosure are not limitedthereto.

In Formulae 2-1 to 2-4, L₁ to L₁₀ may each independently be selectedfrom a substituted or unsubstituted C₃-C₁₀ cycloalkylene group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a substitutedor unsubstituted C₁-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₁-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic condensed heteropolycyclic group.

In some embodiments, in Formulae 2-1 to 2-4, L₁ to L₁₀ may be eachindependently selected from:

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), where Q₃₃ to Q₃₅ may be each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group.

For example, in Formulae 2-1 to 2-4, L₁ to L₁₀ may be each independentlyselected from groups represented by Formula 3-1 to Formula 3-42.

In Formulae 3-1 to 3-42,

Y₁ may be selected from O, S, C(Z₃)(Z₄), N(Z₅), and Si(Z₆)(Z₇),

Z₁ to Z₇ may be each independently selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamino group, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), where Q₃₃to Q₃₅ may be each independently selected from a C₁-C₁₀ alkyl group, aC₁-C₁₀ alkoxy group, a phenyl group, and a naphthyl group,

d2 may be 1 or 2,

d3 may be an integer selected from 1 to 3,

d4 may be an integer selected from 1 to 4,

d5 may be an integer selected from 1 to 5,

d6 may be an integer selected from 1 to 6,

d8 may be an integer selected from 1 to 8, and

* and *′ may each be a binding site with an adjacent atom.

In some embodiments, in Formulae 2-1 to 2-4, L₁ to L₁₀ may be eachindependently selected from groups represented by Formula 4-1 to Formula4-36. However embodiments of the present disclosure are not limitedthereto.

In Formulae 4-1 and 4-36, * and *′ may each be a binding site with anadjacent atom.

In Formulae 2-1 to 2-4, a1 to a10 may each independently be an integerselected from 0 to 5. When a1 is 0, *-(L₁)_(a1)-* may be a single bond.When a1 is 2 or greater, at least two L₁s may be the same as ordifferent from each other. In Formulae 2-1 to 2-4, each of a2 to a10 maybe understood based on the description of a1 and the respectivestructures of Formulae 2-1 to 2-4.

For example, in Formulae 2-1 to 2-4a1, a4, a7, and a9 may be eachindependently 0, 1, 2, or 3. In some embodiments, a1, a4, a7, and a9 inFormulae 2-1 to 2-4 may be each independently 1, 2, or 3. In someembodiments, a1, a4, a7, and a9 in Formulae 2-1 to 2-4 may be eachindependently 1 or 2. However, embodiments of the present disclosure arenot limited thereto.

In some embodiments, in Formulae 2-1 to 2-4, a2, a3, a5, a6, a8, and a10may be each independently 0, 1, or 2. However, embodiments of thepresent disclosure are not limited thereto.

In Formulae 2-1 to 2-4, Ar₁ to Ar₆ may each independently be selectedfrom groups represented by Formulae 2-11 to 2-17, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group.

For example, in Formulae 2-1 to 2-4, Ar₁ to Ar₆ may be eachindependently selected from:

groups represented by Formulae 2-11 to 2-17 (for example, groupsrepresented by Formulae 2-11(1), 2-11(2), 2-12(1), 2-12(2), 2-14(1),2-16(1), and/or 2-17(1));

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group; and

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group and—Si(Q₃₃)(Q₃₄)(Q₃₅), where Q₃₃ to Q₃₅ may be each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group. However, embodiments of the present disclosure are notlimited thereto.

In some embodiments, in Formulae 2-1 to 2-4, Ar₁ to Ar₆ may be eachindependently selected from:

groups represented by Formulae 2-11 to 2-17 (for example, groupsrepresented by Formulae 2-11(1), 2-11(2), 2-12(1), 2-12(2), 2-14(1),2-16(1), and/or 2-17(1));

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group; and

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), where Q₃₃ to Q₃₅ may be each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group. However, embodiments of the present disclosure are notlimited thereto.

In Formulae 2-11 to 2-17 (for example, Formulae 2-11(1), 2-11(2),2-12(1), 2-12(2), 2-14(1), 2-16(1), and 2-17(1)), R₂₁ and R₂₂ may beeach independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a substituted or unsubstitutedC₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group,a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and—B(Q₆)(Q₇) where Q₁ to Q₇ may each independently be selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, and amonovalent non-aromatic condensed heteropolycyclic group.

For example, in Formula 2-11 to 2-17 (for example, Formulae 2-11(1),2-11(2), 2-12(1), 2-12(2), 2-14(1), 2-16(1), and 2-17(1)), R₂₁ and R₂₂may be each independently selected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof and a phosphoric acidgroup or a salt thereof;

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group;

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅); and—Si(Q₃)(Q₄)(Q₅),

where Q₃ to Q₅ and Q₃₃ to Q₃₅ may be each independently selected from aC₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group.

In some embodiments, in Formulae 2-11 to 2-17 (for example, Formulae2-11(1), 2-11(2), 2-12(1), 2-12(2), 2-14(1), 2-16(1), and 2-17(1)), R₂₁and R₂₂ may be each independently selected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, an imidazopyridinyl group, and animidazopyrimidinyl group;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, an imidazopyridinyl group, and animidazopyrimidinyl group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅); and—Si(Q₃)(Q₄)(Q₅),

where Q₃ to Q₅ and Q₃₃ to Q₃₅ may be each independently selected from aC₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group. However, embodiments of the present disclosure are notlimited thereto.

In Formulae 2-11 to 2-17 (for example, Formulae 2-11(1), 2-11(2),2-12(1), 2-12(2), 2-14(1), 2-16(1), and 2-17(1)), c1 may be an integerselected from 0 to 5, and c2 may be an integer selected from 0 to 6. Forexample, c1 and c2 may be each independently 0, 1, or 2. However,embodiments of the present disclosure are not limited thereto.

In Formulae 2-1 to 2-4, b1 to b4 may be each independently an integerselected from 1 to 5. For example, b1 to b4 may be each independently 1or 2. However, embodiments of the present disclosure are not limitedthereto.

In some embodiments, R₁ to R₁₂ in Formulae 2A to 2E may be eachindependently selected from a binding site to A₁ in Formula 1 (e.g., achemical bond such as a single bond coupled to A₁ in Formula 1),hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, groups represented byFormulae 5-1 to 5-75, and —Si(Q₃)(Q₄)(Q₅);

Ar₁ to Ar₆ in Formulae 2-1 to 2-4 may be each independently selectedfrom groups represented by Formulae 2-11 to 2-17 and groups representedby Formulae 5-1 to 5-75; and

R₂₁ and R₂₂ in Formulae 2-11 to 2-17 may be each independently selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, groups representedby Formulae 5-1 to 5-75, and —Si(Q₃)(Q₄)(Q₅), where Q₃ to Q₅ may be eachindependently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group,a phenyl group, and a naphthyl group. However, embodiments of thepresent disclosure are not limited thereto.

In some other embodiments, R₁ to R₁₂ in Formulae 2A to 2E may be eachindependently selected from a binding site to A₁ in Formula 1 (e.g., achemical bond such as a single bond coupled to A₁ in Formula 1),hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, groups represented byFormulae 6-1 to 6-43, groups represented by Formulae 10-1 to 10-117, and—Si(Q₃)(Q₄)(Q₅);

Ar₁ to Ar₆ in Formulae 2-1 to 2-4 may be each independently selectedfrom groups represented by Formulae 2-11 to 2-17, groups represented byFormulae 6-1 to 6-43, and groups represented by Formulae 10-1 to 10-117;and

R₂₁ and R₂₂ in Formulae 2-11 to 2-17 may be each independently selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, groups representedby Formulae 6-1 to 6-43, groups represented by Formulae 10-1 to 10-117,and —Si(Q₃)(Q₄)(Q₅), where Q₃ to Q₅ may be each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group. However, embodiments of the present disclosure are notlimited thereto.

In some embodiments, the condensed cyclic compound of Formula 1 may berepresented by one of Formulae 2A-1 to 2E-1.

In Formula 2A-1 to 2E-1, X₁, R₁ to R₁₂, and A₁ may be defined the sameas those described herein.

For example, in Formulae 2A-1 to 2E-1,

X₁ may be O, and

R₁ to R₁₂ may be each independently selected from a binding site to A₁in Formula 1, hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group,groups represented by Formulae 5-1 to 5-75 (for example, the groupsrepresented by Formulae 6-1 to 6-43 and/or the groups represented byFormulae 10-1 to 10-117), and —Si(Q₃)(Q₄)(Q₅), where Q₃ to Q₅ may beeach independently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, a phenyl group, and a naphthyl group. However, embodiments of thepresent disclosure are not limited thereto.

In some embodiments, the condensed cyclic compound of Formula 1 may berepresented by one of Formulae 1(1) to 1(8).

In Formulae 1(1) to 1(8), X₁, R₁ to R₁₂, L₁ to L₁₀, a1 to a10, and Ar₁to Ar₆ may be defined the same as those described herein.

For example, in Formulae 1(1) to 1(8),

X₁ may be O,

L₁ to L₁₀ may be each independently selected from the groups representedby Formulae 3-1 to 3-42,

a1, a4, a7, and a9 may be each independently 1 or 2,

a2, a3, a5, a6, a8, and a10 may be each independently 0, 1, or 2,

R₁ to R₁₂ may be each independently selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamino group, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, the groups represented by Formulae 5-1 to5-75 (for example, the groups represented by Formulae 6-1 to 6-43 and/orFormulae 10-1 to 10-117), and —Si(Q₃)(Q₄)(Q₅),

Ar₁ to Ar₆ may be each independently selected from the groupsrepresented by Formulae 2-11 to 2-17 (for example, the groupsrepresented by Formulae 2-11(1), 2-11(2), 2-12(1), 2-12(2), 2-14(1),2-16(1), and/or 2-17(1)), and the groups represented by Formulae 5-1 to5-75 (for example, the groups represented by Formulae 6-1 to 6-43 and/orFormulae 10-1 to 10-117), and

R₂₁ and R₂₂ in Formulae 2-11 to 2-17 (for example, Formulae 2-11(1),2-11(2), 2-12(1), 2-12(2), 2-14(1), 2-16(1), and 2-17(1)) may be eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, the groups represented by Formulae 5-1 to 5-75 (for example, thegroups represented by Formulae 6-1 to 6-43 and/or Formulae 10-1 to10-117), and —Si(Q₃)(Q₄)(Q₅), where Q₃ to Q₅ may be each independentlyselected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenylgroup, and a naphthyl group. However, embodiments of the presentdisclosure are not limited thereto.

In some embodiments, the condensed cyclic compound of Formula 1 may beone of Compounds 1 to 45. However, embodiments of the present disclosureare not limited thereto.

In the condensed cyclic compound of Formula 1, A₂ may be selected fromthe groups represented by Formulae 2A to 2E that include cores having along conjugation length. Accordingly, the condensed cyclic compound ofFormula 1 may have improved electron transport ability.

In the condensed cyclic compound of Formula 1, A₁ may be selected fromthe groups represented by Formulae 2-1 to 2-4. The groups represented byFormulae 2-1 to 2-4 may form an intramolecular dipole in the condensedcyclic compound of Formula 1, and consequentially may improve theelectron transport ability of the condensed cyclic compound ofFormula 1. Due to the groups represented by Formulae 2-1 to 2-4, thecondensed cyclic compound of Formula 1 may have a bulky structure, andthus improve amorphous characteristics when included in a film.Therefore, an electronic device, for example, an organic light-emittingdevice, including the condensed cyclic compound of Formula 1, may haveimproved long lifetime characteristics.

A synthesis method of the condensed cyclic compound of Formula 1 shouldbe apparent to one of ordinary skill in the art based on the examplesthat are described below.

At least one selected from the condensed cyclic compounds of Formula 1may be used between a pair of electrodes of an organic light-emittingdevice. For example, the condensed cyclic compound of Formula 1 may beincluded in at least one selected from an electron transport region andan emission layer of an organic light-emitting device. In someembodiments, the condensed cyclic compound of Formula 1 may be used as amaterial for capping layers positioned outside a pair of electrodes ofan organic light-emitting device (e.g., positioned on the sides of thefirst and/or second electrode, opposite from the organic layer).

According to some embodiments of the present disclosure, an organiclight-emitting device includes: a first electrode; a second electrodefacing the first electrode; and an organic layer between the firstelectrode and the second electrode, the organic layer including anemission layer and further including at least one selected from thecondensed cyclic compounds of Formula 1.

As used herein, the expression “(an organic layer) may include at leastone selected from the condensed cyclic compounds of Formula 1” mayindicate that “(the organic layer) may include one of the condensedcyclic compounds of Formula 1 or at least two different types (kinds) ofthe condensed cyclic compounds of Formula 1.”

For example, the organic layer may include only Compound 1 as the atleast one selected from the condensed cyclic compounds of Formula 1. Forexample, Compound 1 may be in an electron transport layer of the organiclight-emitting device. In some embodiments, the organic layer mayinclude Compounds 1 and 2 as the at least one selected from thecondensed cyclic compounds of Formula 1. For example, Compounds 1 and 2may be in the same layer (for example, both in the electron transportlayer) or in different layers (for example, Compound 1 may be in theelectron transport layer, and Compound 2 may be in the emission layer).

In some embodiments, the organic layer may include i) a hole transportregion between the first electrode (e.g., an anode) and the emissionlayer and including at least one selected from a hole injection layer, ahole transport layer, a buffer layer, and an electron blocking layer,and ii) an electron transport region between the emission layer and thesecond electrode (e.g., a cathode) and including at least one selectedfrom a hole blocking layer, an electron transport layer, and an electroninjection layer. At least one selected from the electron transportregion and the emission layer may include the at least one selected fromthe condensed cyclic compounds of Formula 1. For example, the electrontransport region of the organic light-emitting device may include anelectron transport layer, and the electron transport layer may includethe at least one selected from the condensed cyclic compounds ofFormula 1. In some embodiments, the emission layer of the organiclight-emitting device may include the at least one selected from thecondensed cyclic compounds of Formula 1. The condensed cyclic compoundof Formula 1 in the emission layer may serve as a host, and the emissionlayer may further include a dopant. For example, the dopant may be aphosphorescent dopant or a fluorescent dopant.

In some embodiments, the organic light-emitting device may furtherinclude at least one selected from a first capping layer and a secondcapping layer, the first capping layer being positioned on an opticalpath along which light generated in the emission layer passes outwardsthrough the first electrode, and the second capping layer beingpositioned on an optical path along which light generated in theemission layer passes outwards through the second electrode, and atleast one selected from the first and second capping layers may includethe at least one selected from the condensed cyclic compounds of Formula1.

For example, the organic light-emitting device may have i) a stackstructure in which the first electrode, the organic layer, the secondelectrode, and the second capping layer are sequentially stacked uponone another in the stated order, ii) a stack structure in which thefirst capping layer, the first electrode, the organic layer, and thesecond electrode are sequentially stacked upon one another in the statedorder, or iii) a stack structure in which the first capping layer, thefirst electrode, the organic layer, the second electrode, and the secondcapping layer are sequentially stacked upon one another in the statedorder, where at least one selected from the first and second cappinglayers may include the at least one selected from the condensed cycliccompounds of Formula 1.

As used herein, the term “organic layer” may refer to a single layerand/or a plurality of layers positioned between the first and secondelectrodes of the organic light-emitting device. A material in the“organic layer” is not limited to an organic material.

Hereinafter, a structure of an organic light-emitting device accordingto one or more embodiments of the present disclosure and a method ofmanufacturing the same will now be described with reference to FIG. 1.

FIG. 1 is a schematic sectional view of an organic light-emittingaccording to an embodiment of the present disclosure. Referring to FIG.1, the organic light-emitting device 10 includes a first electrode 110,an organic layer 150, and a second electrode 190.

A substrate may be positioned under the first electrode 110 or on thesecond electrode 190 in FIG. 1. The substrate may be a glass ortransparent plastic substrate with good mechanical strength, thermalstability, transparency, surface smoothness, ease of handling, and/orwater resistance.

For example, the first electrode 110 may be formed by depositing orsputtering a first electrode-forming material on the substrate. When thefirst electrode 110 is an anode, a material having a high work functionmay be used as the first electrode-forming material to facilitate holeinjection. The first electrode 110 may be a reflective electrode, asemi-transmissive electrode, or a transmissive electrode. Transparentand conductive materials such as ITO, IZO, SnO₂, and/or ZnO may be usedto form the first electrode. The first electrode 110 as asemi-transmissive electrode or a reflective electrode may be formed ofat least one material selected from magnesium (Mg), aluminum (Al),aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), andmagnesium-silver (Mg—Ag).

The first electrode 110 may have a single-layer structure or amulti-layer structure including a plurality of layers. For example, thefirst electrode 110 may have a three-layered structure of ITO/Ag/ITO,but is not limited thereto.

The organic layer 150 may be positioned on the first electrode 110. Theorganic layer 150 may include an emission layer (EML).

The organic layer 150 may further include a hole transport regionbetween the first electrode and the EML, and an electron transportregion between the EML and the second electrode.

For example, the hole transport region may include at least one selectedfrom a hole injection layer (HIL), a hole transport layer (HTL), abuffer layer, and an electron blocking layer (EBL). For example, theelectron transport layer may include at least one selected from a holeblocking layer (HBL), an electron transport layer (ETL), and an electroninjection layer (EIL). However, embodiments of the present disclosureare not limited thereto.

The hole transport region may have a single-layered structure includinga single material, a single-layered structure including a plurality ofmaterials, or a multi-layered structure including a plurality of layersincluding different materials.

In some embodiments, the hole transport region may have a single-layeredstructure including a plurality of materials, or a multi-layeredstructure of HIL/HTL, HIL/HTL/buffer layer, HIL/buffer layer, HTL/bufferlayer, or HIL/HTL/EBL, wherein these layers forming a multi-layeredstructure are sequentially stacked on the first electrode 110 in theorder stated above. However, embodiments of the present disclosure arenot limited thereto.

When the hole transport region includes a HIL, the HIL may be formed onthe first electrode 110 by using any of a variety of suitable methods,for example, by using vacuum deposition, spin coating, casting,Langmuir-Blodgett (LB) deposition, inkjet printing, laser printing,laser induced thermal imaging (LITI), and/or the like.

When the HIL is formed using vacuum deposition, the depositionconditions may vary depending on the material that is used to form theHIL and the structure of the HIL. For example, the deposition conditionsmay be selected from the following conditions: a deposition temperatureof about 100° C. to about 500° C., a degree of vacuum of about 10⁻⁸ toabout 10⁻³ torr, and a deposition rate of about 0.01 to 100 Å/sec.

When the HIL is formed using spin coating, the coating conditions mayvary depending on the material that is used to form the HIL and thestructure of the HIL. For example, the coating conditions may beselected from the following conditions: a coating rate of about 2,000rpm to about 5,000 5 pm and a heat treatment temperature of about 800°C. to about 200° C.

When the hole transport region includes a HTL, the HTL may be formed onthe first electrode 110 or the HIL by using any of a variety of suitablemethods, for example, by using vacuum deposition, spin coating, casting,Langmuir-Blodgett (LB) deposition, inkjet printing, laser printing,laser induced thermal imaging (LITI), and/or the like. When the HTL isformed using vacuum deposition and/or spin coating, the conditions fordeposition and coating may be similar to the above-described depositionand coating conditions for forming the HIL, and accordingly will not bedescribed in detail.

For example, the hole transport region may include at least one selectedfrom the condensed cyclic compounds of Formula 1. For example, the holetransport region may include a HTL, and the HTL may include the at leastone selected from the condensed cyclic compounds of Formula 1.

In some embodiments, the hole transport region may include at least oneselected from m-MTDATA, TDATA, 2-TNATA, NPB, 6-NPB, TPD, Spiro-TPD,Spiro-NPB, methylated-NPB, TAPC, HMTPD,4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA),polyaniline/dodecylbenzene sulfonic acid (Pani/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate)(PEDOT/PSS),polyaniline/camphor sulfonic acid (Pani/CSA),polyaniline/poly(4-styrenesulfonate) (PANI/PSS), a compound representedby Formula 201, and a compound represented by Formula 202.

In Formulae 201 and 202,

L₂₀₁ to L₂₀₅ may be each independently defined as L₁ described above inconjunction with Formula 1,

xa1 to xa4 may be each independently selected from 0, 1, 2, and 3,

xa5 may be selected from 1, 2, 3, 4, and 5, and

R₂₀₁ to R₂₀₄ may be each independently selected from a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, and a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group.

For example, in Formulae 201 and 202,

L₂₀₁ to L₂₀₅ may be each independently selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a pyrenylene group, a chrysenylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, aquinolinylene group, an isoquinolinylene group, a quinoxalinylene group,a quinazolinylene group, a carbazolylene group, and a triazinylene; and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a pyrenylene group, a chrysenylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, aquinolinylene group, an isoquinolinylene group, a quinoxalinylene group,a quinazolinylene group, a carbazolylene group, and a triazinylenegroup, each substituted with at least one selected from deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, aquinolinyl group, an isoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, and a triazinyl group,

xa1 to xa4 may be each independently 0, 1, or 2,

xa5 may be 1, 2, or 3, and

R₂₀₁ to R₂₀₄ may be each independently selected from:

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a naphthyl group, an azulenyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group. However, embodiments of thepresent disclosure are not limited thereto.

The compound of Formula 201 may be represented by Formula 201A:

For example, the compound of Formula 201 may be represented by Formula201A-1, but is not limited thereto:

The compound of Formula 202 may be represented by Formula 202A, but isnot limited thereto:

In Formulae 201A, 201A-1, and 202A,

L₂₀₁ to L₂₀₃, xa1 to xa3, xa5, and R₂₀₂ to R₂₀₄ may be defined asdescribed in conjunction with Formulae 201 and 202;

R₂₁₁ and R₂₁₂ may be each independently defined as R₂₀₃ described inconjunction with Formula 201; and

R₂₁₃ to R₂₁₆ may be each independently selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, and a monovalent non-aromatic condensed heteropolycyclic group.

The compound represented by Formula 201, and the compound represented byFormula 202 may each independently include compounds HT1 to HT20, butare not limited thereto.

The thickness of the hole transport region may be from about 100 Δ toabout 10,000 Å, and in some embodiments, from about 100 Å to about 1,000Å. When the hole transport region includes a HIL and a HTL, thethickness of the HIL may be from about 100 Å to about 10,000 Å, and insome embodiments, from about 100 Å to about 1,000 Å, and a thickness ofthe HTL may be from about 50 Å to about 2,000 Å, and in someembodiments, from about 100 Å to about 1,500 Å. When the thicknesses ofthe hole transport region, the HIL, and the HTL are within any of theseranges, satisfactory hole transport characteristics may be obtainedwithout a substantial increase in driving voltage.

The hole transport region may further include a charge-generatingmaterial to improve conductivity, in addition to the materials describedabove. The charge-generating material may be homogeneously orinhomogeneously dispersed in the hole transport region.

The charge-generating material may be, for example, a p-dopant. Thep-dopant may be selected from quinone derivatives, metal oxides, andcompounds with a cyano group, but is not limited thereto. Non-limitingexamples of the p-dopant include quinone derivatives such astetracyanoquinonedimethane (TCNQ),2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ),and/or the like; metal oxides such as tungsten oxide, molybdenum oxide,and/or the like; and Compound HT-D1 below.

The hole transport region may further include at least one selected froma buffer layer and an EBL, in addition to the HIL and HTL describedabove. The buffer layer may compensate for an optical resonance distanceof light according to a wavelength of the light emitted from the EML,and thus may improve light-emission efficiency. A material in the bufferlayer may be any material used in the hole transport region. The EBL mayblock migration of electrons from the electron transport region into theEML.

The EML may be formed on the first electrode 110 or the hole transportregion by using any of a variety of suitable methods, for example, byusing vacuum deposition, spin coating, casting, Langmuir-Blodgett (LB)deposition, inkjet printing, laser printing, laser induced thermalimaging (LITI), and/or the like. When the EML is formed using vacuumdeposition and/or spin coating, the deposition and coating conditionsfor forming the EML may be similar to the above-described deposition andcoating conditions for forming the HIL, and accordingly will not bedescribed in detail

When the organic light-emitting device 10 is a full color organiclight-emitting device, the EML may be patterned into a red emissionlayer, a green emission layer, and a blue emission layer to correspondto individual subpixels, respectively. In some embodiments, the EML mayhave a structure in which a red emission layer, a green emission layerand a blue emission layer are stacked upon one another, or a structureincluding a mixture of a red light-emitting material, a greenlight-emitting material, and a blue light-emitting material, and thusmay emit white light.

The EML may include a host and a dopant. The host may include at leastone selected from the condensed cyclic compounds of Formula 1.

In some embodiments, the host may include a compound represented byFormula 301:Ar₃₀₁-[(L₃₀₁)_(xb1)-R₃₀₁]_(xb2).  Formula 301

In Formula 301,

Ar₃₀₁ may be selected from:

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene,naphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene, and

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene,naphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, a monovalent non-aromatic condensed heteropolycyclic group, and—Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃), where Q₃₀₁ to Q₃₀₃ may be each independentlyselected from hydrogen, C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₆-C₆₀ aryl group, and a C₁-C₆₀ heteroaryl group;

L₃₀₁ may be defined the same as L₁ described herein;

R₃₀₁ may be selected from:

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group,

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a phenyl group, a naphthyl group, a fluorenylgroup, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group,

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazole group, and a triazinyl group, and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazole group, and a triazinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and atriazinyl group;

xb1 may be selected from 0, 1, 2, and 3; and

xb2 may be selected from 1, 2, 3, and 4.

For example, in Formula 301,

L₃₀₁ may be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a pyrenylene group, and a chrysenylene group, and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a pyrenylene group, and a chrysenylene group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, and a chrysenyl group;

R₃₀₁ may be selected from:

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group,

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a phenyl group, a naphthyl group, a fluorenylgroup, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, and a chrysenyl group,

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, and a chrysenyl group, and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, and a chrysenyl group,each substituted with at least one selected from deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid group or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group and achrysenyl group. However, embodiments of the present disclosure are notlimited thereto.

For example, the host may include a compound represented by Formula301A:

L₃₀₁, R₃₀₁, xb1, and xb2 in Formula 301A may be defined the same asthose described herein.

In some embodiments, the compound of Formula 301 may be at least oneselected from Compounds H1 to H42. However, embodiments of the presentdisclosure are not limited thereto.

In some embodiments, the host may include at least one selected fromCompounds H43 to H49. However, embodiments of the present disclosure arenot limited thereto.

In some embodiments, the host may include one of the following compoundsillustrated below. However, embodiments of the present disclosure arenot limited thereto.

The dopant in the emission layer may include a phosphorescent dopant ora fluorescent dopant.

The phosphorescent dopant may include an organometallic complexrepresented by Formula 401:

In Formula 401,

M may iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium(Zr), hafnium (Hf), europium (Eu), terbium (Tb), or thulium (Tm);

X₄₀₁ to X₄₀₄ may be each independently a nitrogen (N) or a carbon (C);

rings A₄₀₁ and A₄₀₂ may be each independently selected from asubstituted or unsubstituted benzene, a substituted or unsubstitutednaphthalene, a substituted or unsubstituted fluorene, a substituted orunsubstituted spiro-fluorene, a substituted or unsubstituted indene, asubstituted or unsubstituted pyrrole, a substituted or unsubstitutedthiophene, a substituted or unsubstituted furan, a substituted orunsubstituted imidazole, a substituted or unsubstituted pyrazole, asubstituted or unsubstituted thiazole, a substituted or unsubstitutedisothiazole, a substituted or unsubstituted oxazole, a substituted orunsubstituted isoxazole, a substituted or unsubstituted pyridine, asubstituted or unsubstituted pyrazine, a substituted or unsubstitutedpyrimidine, a substituted or unsubstituted pyridazine, a substituted orunsubstituted quinoline, a substituted or unsubstituted isoquinoline, asubstituted or unsubstituted benzoquinoline, a substituted orunsubstituted quinoxaline, a substituted or unsubstituted quinazoline, asubstituted or unsubstituted carbazole, a substituted or unsubstitutedbenzoimidazole, a substituted or unsubstituted benzofuran, a substitutedor unsubstituted benzothiophene, a substituted or unsubstitutedisobenzothiophene, a substituted or unsubstituted benzoxazole, asubstituted or unsubstituted isobenzoxazole, a substituted orunsubstituted triazole, a substituted or unsubstituted oxadiazole, asubstituted or unsubstituted triazine, a substituted or unsubstituteddibenzofuran, and a substituted or unsubstituted dibenzothiophene;

at least one substituent of the substituted benzene, the substitutednaphthalene, the substituted fluorene, the substituted spiro-fluorene,the substituted indene, the substituted pyrrole, the substitutedthiophene, the substituted furan, the substituted imidazole, thesubstituted pyrazole, the substituted thiazole, the substitutedisothiazole, the substituted oxazole, the substituted isoxazole, thesubstituted pyridine, the substituted pyrazine, the substitutedpyrimidine, the substituted pyridazine, the substituted quinoline, thesubstituted isoquinoline, the substituted benzoquinoline, thesubstituted quinoxaline, the substituted quinazoline, the substitutedcarbazole, the substituted benzoimidazole, the substituted benzofuran,the substituted benzothiophene, the substituted isobenzothiophene, thesubstituted benzoxazole, the substituted isobenzoxazole, the substitutedtriazole, the substituted oxadiazole, the substituted triazine, thesubstituted dibenzofuran, and the substituted dibenzothiophene may beselected from:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxyl group, a C₆-C₆₀ arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—N(Q₄₀₁)(Q₄₀₂), —Si(Q₄₀₃)(Q₄₀₄)(Q₄₀₅), and —B(Q₄₀₆)(Q₄₀₇),

a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group,

a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₂-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₂-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₂-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₄₁₁)(Q₄₁₂),—Si(Q₄₁₃)(Q₄₁₄)(Q₄₁₅), and —B(Q₄₁₆)(Q₄₁₇), and

—N(Q₄₂₁)(Q₄₂₂), —Si(Q₄₂₃)(Q₄₂₄)(Q₄₂₅), and —B(Q₄₂₆)(Q₄₂₇);

L₄₀₁ may be an organic ligand;

xc1 may be 1, 2, or 3; and

xc2 may be 0, 1, 2, or 3,

where Q₄₀₁ to Q₄₀₇, Q₄₁₁ to Q₄₁₇ and Q₄₂₁ to Q₄₂₇ may be eachindependently selected from hydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₆-C₆₀ aryl group, and a C₂-C₆₀ heteroaryl group.

For example, in Formula 401, L₄₀₁ may be a monovalent, divalent, ortrivalent organic ligand. For example, L₄₀₁ in Formula 401 may beselected from a halogen ligand (for example, Cl and/or F), a diketoneligand (for example, acetylacetonate, 1,3-diphenyl-1,3-propanedionate,2,2,6,6-tetramethyl-3,5-heptanedionate, and/or hexafluoroacetonate), acarboxylic acid ligand (for example, picolinate,dimethyl-3-pyrazolecarboxylate, and/or benzoate), a carbon monoxideligand, an isonitrile ligand, a cyano ligand, and a phosphorous ligand(for example, phosphine and/or phosphite). However, embodiments of thepresent disclosure are not limited thereto.

When A₄₀₁ in Formula 401 has at least two substituent groups, the atleast two substituent groups of A₄₀₁ may be linked (e.g., coupled) toeach other to form a saturated or unsaturated ring.

When A₄₀₂ in Formula 401 has at least two substituents groups, the atleast two substituent groups of A₄₀₂ 2 may be linked (e.g., coupled) toeach other to form a saturated or unsaturated ring.

When xc1 in Formula 401 is 2 or greater, a plurality of ligands

in Formula 401 may be identical to or different from each other. Whenxc1 in Formula 1 is 2 or greater, A₄₀₁ and/or A₄₀₂ of one ligand may berespectively linked to A₄₀₁ and/or A₄₀₂ of an adjacent ligand, directly(e.g., via a chemical bond such as a single bond) or via a linking group(for example, a C₁-C₅ alkylene group, —N(R′)— (where R′ is a C₁-C₁₀alkyl group or a C₆-C₂₀ aryl group), and/or C(═O)—).

The phosphorescent dopant may include at least one selected fromCompounds PD1 to PD75, but is not limited thereto.

In Compounds PD1 to PD75, “Me” may refer to a methyl group, “Ph” mayrefer to a phenyl group, and “Bu^(t)” may refer to a tert-butyl group.

For example, the fluorescent dopant may include a compound representedby Formula 501:

In Formula 501,

Ar₅₀₁ may be selected from:

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, anaphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene,

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, anaphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₂-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₂-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₂-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, a monovalent non-aromatic condensed heteropolycyclic group, and—Si(Q₅₀₁)(Q₅₀₂)(Q₅₀₃), where Q₅₀₁ to Q₅₀₃ may be each independentlyselected from hydrogen, C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, aC₆-C₆₀ aryl group, and a C₂-C₆₀ heteroaryl group;

L₅₀₁ to L₅₀₃ may be each independently defined the same as L₁ definedherein;

R₅₀₁ and R₅₀₂ may be each independently selected from:

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazoly group, a triazinyl group, adibenzofuranyl group, and a dibenzothiophenyl group, and

a phenyl group, a naphthyl group, a fluorenyl group, spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, a triazinyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from a phenyl group, deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, atriazinyl group, and a dibenzofuranyl group, and a dibenzothiophenylgroup;

xd1 to xd3 may be each independently selected from 0, 1, 2, and 3; and

xd4 may be selected from 1, 2, 3, and 4.

For example, the fluorescent host may include at least one selected fromCompounds FD1 to FD9.

In some embodiments, the fluorescent dopant may be selected from thefollowing compounds illustrated below. However, embodiments of thepresent disclosure are not limited thereto.

The amount of the dopant in the EML may be from about 0.01 parts toabout 15 parts by weight based on 100 parts by weight of the host, butis not limited to this range.

The thickness of the EML may be about 100 Å to about 1000 Å, and in someembodiments, may be from about 200 Å to about 600 Å. When the thicknessof the EML is within any of these ranges, the organic light-emittingdevice may have good light emitting ability without a substantialincrease in driving voltage.

The electron transport region may be positioned on the EML.

The electron transport region may include at least one selected from aHBL, an ETL, and an EIL. However, embodiments of the present disclosureare not limited thereto.

In some embodiments, the electron transport region may have a structureincluding ETL/EIL, or a structure including HBL/ETL/EIL, wherein thelayers forming the structure of the electron transport region may besequentially stacked on the EML in the order stated above. However,embodiments of the present disclosure are not limited thereto:

In some embodiments, the organic layer 150 of the organic light-emittingdevice 10 may include the electron transport region between the EML andthe second electrode 190.

The electron transport region may include a condensed cyclic compound ofFormula 1 as described above.

The electron transport region may include a HBL. When the EML includes aphosphorescent dopant, the HBL may prevent or reduce the diffusion oftriplet excitons or holes into the ETL from the EML.

When the electron transport region includes a HBL, the HBL may be formedon the EML by using any of a variety of suitable methods, for example,by using vacuum deposition, spin coating, casting, Langmuir-Blodgett(LB) deposition, inkjet printing, laser printing, laser induced thermalimaging (LITI), and/or the like. When the HBL is formed using vacuumdeposition and/or spin coating, the deposition and coating conditionsfor forming the HBL may be similar to the above-described deposition andcoating conditions for forming the HIL, and accordingly will not bedescribed in detail.

For example, the HBL may include at least one selected from BCP andBphen. However, embodiments of the present disclosure are not limitedthereto.

The thickness of the HBL may be from about 20 Å to about 1,000 Å, and insome embodiments, from about 30 Å to about 300 Å. When the thickness ofthe HBL is within any of these ranges, the HBL may have improved holeblocking ability without a substantial increase in driving voltage.

The electron transport region may include an ETL. The ETL may be formedon the EML or the HBL by using any of a variety of suitable methods, forexample, by using vacuum deposition, spin coating, casting,Langmuir-Blodgett (LB) deposition, inkjet printing, laser printing,laser induced thermal imaging (LITI), and/or the like. When the ETL isformed using vacuum deposition and/or spin coating, the deposition andcoating conditions for forming the ETL may be similar to theabove-described deposition and coating conditions for forming the HIL,and accordingly will not be described in detail.

The ETL may include the condensed cyclic compound of Formula 1 accordingto embodiments of the present disclosure.

The thickness of the ETL may be from about 100 Å to about 1,000 Å, andin some embodiments, from about 150 Å to about 500 Å. When the thicknessof the ETL is within any of these ranges, the organic light-emittingdevice may have satisfactory electron transporting ability without asubstantial increase in driving voltage.

In some embodiments the ETL may further include a metal-containingmaterial, in addition to the above-described materials.

The metal-containing material may include a lithium (Li) complex.Non-limiting examples of the Li complex include compound ET-D1 (lithiumquinolate (LiQ)) and compound ET-D2 illustrated below.

The electron transport region may further include an EIL that mayfacilitate injection of electrons from the second electrode 190.

The EIL may be formed on the ETL by using any of a variety of suitablemethods, for example, by using vacuum deposition, spin coating, casting,Langmuir-Blodgett (LB) deposition, inkjet printing, laser printing,laser induced thermal imaging (LITI), and/or the like. When the EIL isformed using vacuum deposition and/or spin coating, the deposition andcoating conditions for forming the EIL may be similar to theabove-described deposition and coating conditions for forming the HIL,and accordingly will not be described in detail.

The EIL may include at least one selected from LiF, NaCl, CsF, Li₂O,BaO, and LiQ.

The thickness of the EIL may be from about 1 Å to about 100 Å, and insome embodiments, from about 3 Å to about 90 Å. When the thickness ofthe EIL is within any of these ranges, the EIL may have satisfactoryelectron injection ability without a substantial increase in drivingvoltage.

The second electrode 190 may be positioned on the organic layer 150, asdescribed above. The second electrode 190 may be a cathode as anelectron injecting electrode. A material for forming the secondelectrode 190 may be a metal, an alloy, an electrically conductivecompound, which have a low-work function, or a mixture thereof.Non-limiting examples of the material for forming the second electrode190 include lithium (Li), magnesium (Mg), aluminum (Al),aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), andmagnesium-silver (Mg—Ag). In some embodiments, the material for formingthe second electrode 190 may be ITO and/or IZO. The second electrode 190may be a semi-transmissive electrode or a transmissive electrode.

Referring to FIG. 2, an organic light-emitting device 20 according to anembodiment of the present disclosure may have a stacked structure inwhich a first capping layer 210, a first electrode 110, an organic layer150, and a second electrode 190 are sequentially stacked upon oneanother in the stated order. Referring to FIG. 3, an organiclight-emitting device 30 according to another embodiment may have astacked structure in which a first electrode 110, an organic layer 150,a second electrode 190, and a second capping layer 220 are sequentiallystacked upon one another in the stated order. Referring to FIG. 4, anorganic light-emitting device 40 may have a stacked structure in which afirst capping layer 210, a first electrode 110, an organic layer 150, asecond electrode 190, and a second capping layer 220 are stacked uponone another in the stated order.

In FIGS. 2 to 4, the first electrode 110, the organic layer 150, and thesecond electrode 190 may be the same as those described above withreference to FIG. 1

In the organic light-emitting devices 20 and 40, light generated in theemission layer of the organic layer 150 may be extracted outside theorganic light-emitting device through the first electrode 110 (e.g., asa semi-transmissive or transmissive electrode) and the first cappinglayer 210. In the organic light-emitting devices 30 and 40, lightgenerated in the emission layer of the organic layer 150 may beextracted outside the organic light-emitting device through the secondelectrode 190 (e.g., as a semi-transmissive or transmissive electrode)and the second capping layer 220.

The first capping layer 210 and the second capping layer 220 may improveexternal emission efficiency based on the principle of constructiveinterference.

The first capping layer 210 of FIG. 2 and the second capping layer 220of FIG. 3 may each include at least one selected from the condensedcyclic compounds of Formula 1.

In the organic light-emitting device of FIG. 4, at least one selectedfrom the first capping layer 210 and the second capping layer 220 mayinclude the at least one selected from the condensed cyclic compounds ofFormula 1.

In some embodiments, in the organic light-emitting devices 20, 30, and40 of FIGS. 2 to 4, the organic layer 150 may not include the at leastone selected from the condensed cyclic compounds of Formula 1.

Although the organic light-emitting devices of FIGS. 1 to 4 have beendescribed above, embodiments of the present disclosure are not limitedthereto.

As used herein, a C₁-C₆₀ alkyl group may refer to a linear or branchedaliphatic hydrocarbon monovalent group having 1 to 60 carbon atoms.Non-limiting examples of the C₁-C₆₀ alkyl group include a methyl group,an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group.A C₁-C₆₀ alkylene group refers to a divalent group having the samestructure as the C₁-C₆₀ alkyl group.

As used herein, a C₁-C₆₀ alkoxy group may refer to a monovalent grouprepresented by —OA₁₀₁ (where A₁₀₁ is the C₁-C₆₀ alkyl group as describedabove).

Non-limiting examples of the C₁-C₆₀ alkoxy group include a methoxygroup, an ethoxy group, and an isopropyloxy group.

As used herein, a C₂-C₆₀ alkenyl group may refer to a hydrocarbon groupincluding at least one carbon double bond at one or more positions alonga carbon chain of the C₂-C₆₀ alkyl group (e.g., in the middle or ateither terminal end of the C₂-C₆₀ alkyl group). Non-limiting examples ofthe C₂-C₆₀ alkenyl group include an ethenyl group, a propenyl group, anda butenyl group. A C₂-C₆₀ alkylene group refers to a divalent grouphaving the same structure as the C₂-C₆₀ alkenyl group.

As used herein, a C₂-C₆₀ alkynyl group may refer to a hydrocarbon groupincluding at least one carbon triple bond at one or more positions alonga carbon chain of the C₂-C₆₀ alkyl group (e.g., in the middle or ateither terminal end of the C₂-C₆₀ alkyl group). Non-limiting examples ofthe C₂-C₆₀ alkynyl group include an ethynyl group and a propynyl group.A C₂-C₆₀ alkynylene group used herein refers to a divalent group havingthe same structure as the C₂-C₆₀ alkynyl group.

As used herein, a C₃-C₁₀ cycloalkyl group may refer to a monovalent,monocyclic hydrocarbon group having 3 to 10 carbon atoms. Non-limitingexamples of the C₃-C₁₀ cycloalkyl group include a cyclopropyl group, acyclobutyl group, a cyclopentyl group, a cyclohexyl group, and acycloheptyl group. A C₃-C₁₀ cycloalkylene group refers to a divalentgroup having the same structure as the C₃-C₁₀ cycloalkyl group.

As used herein, a C₁-C₁₀ heterocycloalkyl group may refer to amonovalent monocyclic group having 1 to 10 carbon atoms and at least onehetero atom selected from N, O, P, and S as a ring-forming atom.Non-limiting examples of the C₁-C₁₀ heterocycloalkyl group include atetrahydrofuranyl group and a tetrahydrothiophenyl group. A C₁-C₁₀heterocycloalkylene group refers to a divalent group having the samestructure as the C₁-C₁₀ heterocycloalkyl group.

As used herein, a C₃-C₁₀ cycloalkenyl group may refer to a monovalentmonocyclic group that has 3 to 10 carbon atoms, includes at least onedouble bond in the ring, but does not have aromaticity. Non-limitingexamples of the C₃-C₁₀ cycloalkenyl group include a cyclopentenyl group,a cyclohexenyl group, and a cycloheptenyl group. A C₃-C₁₀cycloalkenylene group refers to a divalent group having the samestructure as the C₃-C₁₀ cycloalkenyl group.

As used herein, a C₁-C₁₀ heterocycloalkenyl group used herein may referto a monovalent monocyclic group that has 1 to 10 carbon atoms, includesat least one double bond in the ring, and in which at least one heteroatom selected from N, O, Si, P, and S is included as a ring-formingatom. Non-limiting examples of the C₁-C₁₀ heterocycloalkenyl groupinclude a 2,3-hydrofuranyl group and a 2,3-hydrothiophenyl group. AC₁-C₁₀ heterocycloalkenylene group used herein refers to a divalentgroup having the same structure as the C₁-C₁₀ heterocycloalkenyl group.

As used herein, a C₆-C₆₀ aryl group may refer to a monovalent, aromaticcarbocyclic group having 6 to 60 carbon atoms, and a C₆-C₆₀ arylenegroup refers to a divalent, aromatic carbocyclic group having 6 to 60carbon atoms. Non-limiting examples of the C₆-C₆₀ aryl group include aphenyl group, a naphthyl group, an anthracenyl group, a phenanthrenylgroup, a pyrenyl group, and a chrysenyl group. When the C₆-C₆₀ arylgroup and/or the C₆-C₆₀ arylene group include at least two rings, therings may be fused (e.g., coupled) to each other.

As used herein, a C₁-C₆₀ heteroaryl group may refer to a monovalent,aromatic carbocyclic group having 1 to 60 carbon atoms and at least onehetero atom selected from N, O, Si, P, and S as a ring-forming atom. AC₁-C₆₀ heteroarylene group refers to a divalent, aromatic carbocyclicgroup having 1 to 60 carbon atoms and at least one hetero atom selectedfrom N, O, P, and S as a ring-forming atom. Non-limiting examples of theC₁-C₆₀ heteroaryl group include a pyridinyl group, a pyrimidinyl group,a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinylgroup, and an isoquinolinyl group. When the C₁-C₆₀ heteroaryl and/or theC₁-C₆₀ heteroarylene include at least two rings, the rings may be fused(e.g., coupled) to each other.

As used herein, a C₆-C₆₀ aryloxy group may refer to a monovalent grouprepresented by —OA₁₀₂ (where A₁₀₂ is the C₆-C₆₀ aryl group as describedabove), and a C₆-C₆₀ arylthio group may refer to a monovalent grouprepresented by —SA₁₀₃ (where A₁₀₃ is the C₆-C₆₀ aryl group as describedabove).

As used herein, a monovalent non-aromatic condensed polycyclic group mayrefer to a monovalent group having at least two rings condensed to eachother, in which only carbon atoms (for example, 8 to 60 carbon atoms)are exclusively included as ring-forming atoms and the entire moleculedoes not have overall aromaticity. A non-limiting example of themonovalent non-aromatic condensed polycyclic group is a fluorenyl group.A divalent non-aromatic condensed polycyclic group refers to a divalentgroup having the same structure as the monovalent non-aromatic condensedpolycyclic group.

As used herein, a monovalent non-aromatic condensed heteropolycyclicgroup may refer to a monovalent group having at least two ringscondensed to each other, in which carbon atoms (for example, 1 to 60carbon atoms) and at least one hetero atom selected from N, O, Si, P,and S are included as ring-forming atoms and the entire molecule doesnot have overall aromaticity. A non-limiting example of the monovalentnon-aromatic condensed heteropolycyclic group is a carbazolyl group. Adivalent non-aromatic condensed heteropolycyclic group refers to adivalent group having the same structure as the monovalent non-aromaticcondensed heteropolycyclic group.

As used herein, at least one substituent of the substituted C₃-C₁₀cycloalkylene group, the substituted C₁-C₁₀ heterocycloalkylene group,the substituted C₃-C₁₀ cycloalkenylene group, the substituted C₁-C₁₀heterocycloalkenylene group, the substituted C₆-C₆₀ arylene group, thesubstituted C₁-C₆₀ heteroarylene group, the substituted divalentnon-aromatic condensed polycyclic group, the substituted divalentnon-aromatic condensed heteropolycyclic group, the substituted C₁-C₆₀alkyl group, the substituted C₂-C₆₀ alkenyl group, the substitutedC₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxy group, thesubstituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀arylthio group, the substituted C₁-C₆₀ heteroaryl group, the substitutedmonovalent non-aromatic condensed polycyclic group, and the substitutedmonovalent non-aromatic condensed heteropolycyclic group, may beselected from:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group,

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxyl group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and —B(Q₁₆)(Q₁₇),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group,

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),—Si(Q₂₃)(Q₂₄)(Q₂₅), and —B(Q₂₆)(Q₂₇), and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇),

where Q₁₁ to Q₁₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ may be each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group,a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, and amonovalent non-aromatic condensed heteropolycyclic group.

The acronym “Ph” used herein may refer to phenyl, the acronym “Me” usedherein may refer to methyl, the acronym “Et” used herein may refer toethyl, and the acronym “ter-Bu” or “Bu^(t)” used herein may refer totert-butyl.

One or more embodiments of the present disclosure directed to condensedcyclic compounds, and organic light-emitting devices including the same,will now be described in more detail with reference to the followingexamples. However, these examples are only for illustrative purposes andare not intended to limit the scope of embodiments of the presentdisclosure. In the following synthesis examples, the expression “‘B’,instead of ‘A’, was used” may indicate that the amounts of ‘B’ and ‘A’were the same in equivalent amounts.

EXAMPLES Synthesis Example 1: Synthesis of Compound 1

Synthesis of Intermediate I-1

5.73 g (20 mmol) of (1,1′-binaphthalene)-2,2′-diol and 4.10 g (20 mmol)of p-TsOH were dissolved in 150 mL of toluene, and then stirred at about100° C. for about 12 hours. The resulting product was cooled down toroom temperature, and an aqueous potassium carbonate solution was addedthereto, followed by extraction three times with 60 mL of ethyl acetate.An organic layer was collected from the resulting product and driedusing magnesium sulfate. After evaporating the solvent from theresulting product, the residue was separated and purified using silicagel column chromatography to obtain 3.76 g (Yield: 70%) of IntermediateI-1. This compound was identified using liquid chromatography-massspectrometry (LC-MS).

C₂₀H₁₂O: M+1 268.3

Synthesis of Intermediate I-2

3.76 g (14 mmol) of Intermediate I-1 was dissolved in 80 mL oftetrahydrofuran (THF), and 5.6 mL of nBuLi (2.5M in Hexane) was addedthereto at about −78° C. After 1 hour, 3.64 mL (18.2 mmol) of2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane was added theretoat the same temperature and stirred at room temperature for about 5hours. Water was then added thereto, followed by extraction three timeswith 30 mL of diethyl ether. A diethyl ether layer was collected fromthe resulting product, and dried using MgSO₄, and then under reducedpressure, the resulting residue was separated and purified using silicagel column chromatography to obtain 4.97 g (Yield: 90%) of IntermediateI-2. This compound was identified using LC-MS.

C₂₆H₂₃BO₃: M+1 394.3

Synthesis of Compound 1

4.97 g (12.6 mmol) of Intermediate I-2, 4.50 g (12.6 mmol) of(3-bromophenyl)-diphenylphosphine oxide, 0.73 g (0.63 mmol) ofPd(PPh₃)₄, and 5.22 g (37.8 mmol) of K₂CO₃ were dissolved in 80 mL of amixed solution of THF and H₂O (2:1 by volume) and stirred at about 80°C. for about 12 hours. The resulting product was cooled down to roomtemperature and extracted three times with 30 mL of water and 30 mL ofethyl acetate. An organic layer was collected and dried using magnesiumsulfate. After evaporating the solvent from the resulting product, theresidue was separated and purified using silica gel columnchromatography to obtain 5.49 g of Compound 1 (Yield: 80%). Thiscompound was identified using mass spectroscopy/fast atom bombardment(MS/FAB) and ¹H nuclear magnetic resonance spectroscopy (NMR) (resultsshown in Table 1).

C₃₈H₂₅O₂P cal. 544.16. found 544.17.

Synthesis Example 2: Synthesis of Compound 2

5.35 g (Yield: 78%) of Compound 2 was obtained in the same (orsubstantially the same) manner as in Synthesis Example 1, except that(4-bromophenyl)-diphenylphosphine oxide, instead of(3-bromophenyl)-diphenylphosphine oxide used in the synthesis ofCompound 1 in Synthesis Example 1, was used. This compound wasidentified using MS/FAB and ¹H NMR (results shown in Table 1).

C₃₈H₂₅O₂P cal. 544.16. found 544.18.

Synthesis Example 3: Synthesis of Compound 11

4.47 g (Yield: 65%) of Compound 11 was obtained in the same (orsubstantially the same) manner as in Synthesis Example 1, except that(6-bromopyridine-2-yl)-diphenylphosphine oxide, instead of(3-bromophenyl)-diphenylphosphine oxide used in the synthesis ofCompound 1 in Synthesis Example 1, was used. This compound wasidentified using MS/FAB and ¹H NMR (results shown in Table 1).

C₃₇H₂₄NO₂P cal. 545.15. found 545.16.

Synthesis Example 4: Synthesis of Compound 23

4.09 g (Yield: 67%) of Compound 23 was obtained in the same (orsubstantially the same) manner as in Synthesis Example 1, except that1-bromo-3-(phenylsulfonyl)benzene, instead of(3-bromophenyl)-diphenylphosphine oxide used in the synthesis ofCompound 1 in Synthesis Example 1, was used. This compound wasidentified using MS/FAB and ¹H NMR (results shown in Table 1).

C₃₂H₂₀O₃S cal. 484.11. found 484.10.

Synthesis Example 5: Synthesis of Compound 24

4.39 g (Yield: 72%) of Compound 24 was obtained in the same (orsubstantially the same) manner as in Synthesis Example 1, except that1-bromo-4-(phenylsulfonyl)benzene, instead of(3-bromophenyl)-diphenylphosphine oxide used in the synthesis ofCompound 1 in Synthesis Example 1, was used. This compound wasidentified using MS/FAB and ¹H NMR (results shown in Table 1).

C₃₂H₂₀O₃S cal. 484.11. found 484.12.

¹H NMR and MS/FAB data of the compounds synthesized in the abovesynthesis examples are shown in Table 1. Additional compounds may besynthesized using appropriate intermediate materials, according to thesame (or substantially the same) synthesis method as in the syntheticpathways described above.

Synthetic pathways and source materials for synthesizing compounds notshown in Table 1 should be apparent to those of ordinary skill in theart based on the synthetic pathways and source materials in theabove-described synthesis examples.

TABLE 1 MS/FAB Compound ¹H NMR (CDCl₃, 400 MHz) δ found calc. 18.86-8.82 (m, 2H), 8.20-8.17 (m, 1H), 8.08-8.06 (m, 544.17 544.16 1H),7.97-7.95 (m, 1H), 7.92-7.78 (m, 5H), 7.73 (d, 1H), 7.68-7.62 (m, 5H),7.53-7.39 (m, 9H) 2 8.87-8.81 (m, 2H), 7.93-7.90 (m, 3H), 7.85-7.77 (m,544.18 544.16 7H), 7.74-7.65 (m, 5H), 7.52-7.38 (m, 8H) 11 8.85-8.80 (m,3H), 8.65-8.63 (m, 1H), 8.59-8.55 (m, 545.16 545.15 1H), 8.14 (d, 1H),8.03 (dd, 1H), 7.92-7.90 (m, 2H), 7.84-7.77 (m, 6H), 7.73 (d, 1H),7.55-7.40 (m, 8H) 23 8.83-8.80 (m, 2H), 8.54 (t, 1H), 8.28 (d, 1H),484.10 484.11 7.97-7.78 (m, 9H), 7.73 (d, 1H), 7.63-7.58 (m, 2H),7.55-7.50 (m, 2H), 7.47-7.43 (m, 2H) 24 8.85-8.81 (m, 2H), 8.33 (t, 1H),7.97-7.88 (m, 9H), 484.12 484.11 7.84-7.78 (m, 2H), 7.72 (d, 1H),7.59-7.55 (m, 1H), 7.52-7.43 (m, 4H)

Example 1

A 15 Ω/cm² ITO glass substrate (having a thickness of 1200 Å, availablefrom Corning) was cut to a size of 50 mm×50 mm×0.7 mm and then sonicatedin isopropyl alcohol and deionized water each for five minutes, and thencleaned by irradiation of ultraviolet rays for 30 minutes and exposureto ozone. The resulting glass substrate with an ITO anode was mountedinto a vacuum deposition device.

2-TNATA was vacuum-deposited on the ITO anode of the glass substrate toform a hole injection layer (HIL) having a thickness of 600 Å, and4,4′-bis[N-(1-naphthyl)-N-phenylamino group]-biphenyl (hereinafter,“NPB”) was then vacuum-deposited on the HIL to form a hole transportlayer (HTL) having a thickness of about 300 Å.

ADN (as a host) and DPAVBi (as a dopant) were co-deposited on the HTL ina weight ratio of about 98:2 to form an emission layer (EML) having athickness of about 300 Å.

Compound 1 was deposited on the EML to form an electron transport layer(ETL) having a thickness of about 300 Å, and then LiF was deposited onthe ETL to form an electron injection layer (EIL) having a thickness ofabout 10 Å. Aluminum (Al) was then vacuum-deposited on the EIL to form acathode having a thickness of about 3000 Å, thereby completing themanufacture of an organic light-emitting device.

Examples 2 to 5 and Comparative Examples 1 and 2

Organic light-emitting devices were manufactured in the same (orsubstantially the same) manner as in Example 1, except that compounds inTable 2, instead of Compound 1 used in Example 1, were used,respectively, to form the ETL.

Evaluation Example 1

Driving voltages, current densities, luminances, efficiencies, andhalf-lifetimes of the organic light-emitting devices of Examples 1 to 5and Comparative Examples 1 and 2 were evaluated using a KeithleySource-Measure Unit (SMU 236) and a PR650 (Spectroscan) SourceMeasurement Unit (available from Photo Research, Inc.). The evaluationresults are shown in Table 2. A half-lifetime was measured as the timetaken until a measured initial luminance (assumed as 100%) was reducedto 50%.

TABLE 2 Half- Driving Current lifetime ETL voltage density LuminanceEfficiency Emission (hr @100 Example material (V) (mA/cm²) (cd/m²)(cd/A) color mA/cm²) Example 1 Compound 4.35 50 3750 8.25 blue 625 1Example 2 Compound 4.57 50 3800 7.65 blue 596 2 Example 3 Compound 4.4350 3905 8.12 blue 553 11 Example 4 Compound 4.01 50 3825 8.23 blue 62923 Example 5 Compound 4.08 50 3655 8.07 blue 602 24 Comparative Compound5.32 50 3105 6.58 blue 317 Example 1 A Comparative Compound 5.16 50 32206.62 blue 376 Example 2 B

Referring to Table 1, the organic light-emitting devices of Examples 1to 5 were found to have improved driving voltages, improved luminances,improved efficiencies, and improved half-lifetimes, as compared to thoseof the organic light-emitting devices of Comparative Examples 1 and 2.

As described above, according to one or more embodiments of the presentdisclosure, an organic light-emitting device including the condensedcyclic compound of Formula 1 may have low driving voltage, highefficiency, high luminance, and a long lifetime.

As used herein, the terms “use,” “using,” and “used” may be consideredsynonymous with the terms “utilize,” “utilizing,” and “utilized,”respectively.

In addition, the terms “substantially,” “about,” and similar terms areused herein as terms of approximation and not as terms of degree, andare intended to account for the inherent deviations in measured orcalculated values that would be recognized by those of ordinary skill inthe art.

Also, any numerical range recited herein is intended to include allsubranges of the same numerical precision subsumed within the recitedrange. For example, a range of “1.0 to 10.0” is intended to include allsubranges between (and including) the recited minimum value of 1.0 andthe recited maximum value of 10.0, that is, having a minimum value equalto or greater than 1.0 and a maximum value equal to or less than 10.0,such as, for example, 2.4 to 7.6. Any maximum numerical limitationrecited herein is intended to include all lower numerical limitationssubsumed therein and any minimum numerical limitation recited in thisspecification is intended to include all higher numerical limitationssubsumed therein. Accordingly, Applicant reserves the right to amendthis specification, including the claims, to expressly recite anysub-range subsumed within the ranges expressly recited herein. All suchranges are intended to be inherently described in this specificationsuch that amending to expressly recite any such subranges would complywith the requirements of 35 U.S.C. § 112(a) and 35 U.S.C. § 132(a).

It will be understood that the terms, such as “comprises,” “comprising,”“includes”, and/or “including”, when used in this specification, specifythe presence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or groups thereof.

It should further be understood that the example embodiments describedtherein should be considered in a descriptive sense only and not forpurposes of limitation. Descriptions of features or aspects within eachembodiment should typically be considered as available for other similarfeatures or aspects in other embodiments.

While one or more embodiments of the present disclosure have beendescribed with reference to the figures, it will be understood by thoseof ordinary skill in the art that various changes in form and detailsmay be made therein without departing from the spirit and scope of thepresent disclosure as defined by the following claims and equivalentsthereof.

What is claimed is:
 1. A condensed cyclic compound represented byFormula 1:A₂-(A₁)_(n1),  Formula 1 wherein, in Formula 1, A₂ is selected fromgroups represented by Formulae 2B to 2E; A₁ is selected from groupsrepresented by Formulae 2-2 to 2-4; and n1 is an integer selected from 1to 5, wherein, when n1 is 2 or greater, at least two A₁s are the same asor different from each other:

wherein, X₁ and X₂ in Formulae 2B to 2E and Formulae 2-11 to 2-17 areeach independently O or S; R₁ to R₁₂ in Formulae 2B to 2E are eachindependently selected from a binding site to A₁ in Formula 1, hydrogen,deuterium, —F, —Cl, —Br, —I, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇), wherein at least oneselected from R₁ to R₁₂ is a binding site to A₁ in Formula 1, and anumber of binding sites is equal to n1; L₄ to L₁₀ in Formulae 2-2 to 2-4are each independently selected from a substituted or unsubstitutedC₃-C₁₀ cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group; a4 to a10 in Formulae 2-2to 2-4 are each independently an integer selected from 0 to 5; Ar₃ toAr₆ in Formulae 2-2 to 2-4 are each independently selected from groupsrepresented by Formulae 2-11 to 2-17, a substituted or unsubstitutedC₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group,a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group; b2 to b4 in Formulae 2-2to 2-4 are each independently an integer selected from 1 to 5; R₂₁ andR₂₂ in Formulae 2-11 to 2-17 are each independently selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, a nitro group, anamino group, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇); c1 in Formulae 2-11 to 2-17is an integer selected from 0 to 5; and c2 in Formulae 2-11 to 2-17 isan integer selected from 0 to 6, wherein at least one substituent of thesubstituted C₃-C₁₀ cycloalkylene group, the substituted C₁-C₁₀heterocycloalkylene group, the substituted C₃-C₁₀ cycloalkenylene group,the substituted C₁-C₁₀ heterocycloalkenylene group, the substitutedC₆-C₆₀ arylene group, the substituted C₁-C₆₀ heteroarylene group, thesubstituted divalent non-aromatic condensed polycyclic group, thesubstituted divalent non-aromatic condensed heteropolycyclic group, thesubstituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group,the substituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxygroup, the substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀arylthio group, the substituted C₁-C₆₀ heteroaryl group, the substitutedmonovalent non-aromatic condensed polycyclic group, and the substitutedmonovalent non-aromatic condensed heteropolycyclic group is selectedfrom: deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group,a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted withat least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group,C₆-C₆₀ arylthio group, C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇), a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, and a monovalent non-aromatic condensed heteropolycyclic group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),—Si(Q₂₃)(Q₂₄)(Q₂₅), and —B(Q₂₆)(Q₂₇), and —N(Q₃₁)(Q₃₂),—Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇), wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁to Q₂₇, and Q₃₁ to Q₃₇ are each independently selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromaticcondensed polycyclic group, and a monovalent non-aromatic condensedheteropolycyclic group.
 2. The condensed cyclic compound of claim 1,wherein X₁ and X₂ are both O.
 3. The condensed cyclic compound of claim1, wherein R₁ to R₁₂ are each independently selected from: a bindingsite to A₁ in Formula 1, hydrogen, deuterium, —F, —Cl, —Br, —I, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, and a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group and an imidazopyrimidinyl group, a phenyl group,a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, an imidazopyridinyl group, and animidazopyrimidinyl group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), and —Si(Q₃)(Q₄)(Q₅), wherein Q₃ to Q₅ and Q₃₃ to Q₃₅are each independently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀alkoxy group, a phenyl group, and a naphthyl group, and wherein at leastone selected from R₁ to R₁₂ is a binding site to A₁ in Formula 1, and anumber of binding sites is equal to n1.
 4. The condensed cyclic compoundof claim 1, wherein n1 is 1 or
 2. 5. The condensed cyclic compound ofclaim 1, wherein L₄ to L₁₀ are each independently selected from: aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, and aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), wherein Q₃₃ to Q₃₅ are each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group.
 6. The condensed cyclic compound of claim 1, wherein L₄to L₁₀ are each independently selected from groups represented byFormula 3-1 to Formula 3-42:

wherein, in Formulae 3-1 to 3-42, Y₁ is selected from O, S, C(Z₃)(Z₄),N(Z₅), and Si(Z₆)(Z₇); Z₁ to Z₇ are each independently selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a carbazolyl group, a triazinyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅),wherein Q₃₃ to Q₃₅ are each independently selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, a phenyl group, and a naphthyl group; d2is 1 or 2; d3 is an integer selected from 1 to 3; d4 is an integerselected from 1 to 4; d5 is an integer selected from 1 to 5; d6 is aninteger selected from 1 to 6; d8 is an integer selected from 1 to 8;and * and *′ are each independently a binding site with an adjacentatom.
 7. The condensed cyclic compound of claim 1, wherein L₄ to L₁₀ areeach independently selected from groups represented by Formula 4-1 toFormula 4-36:

wherein, in Formulae 4-1 and 4-36, * and *′ are each independently abinding site with an adjacent atom.
 8. The condensed cyclic compound ofclaim 1, wherein a4, a7, and a9 are each independently selected from 1,2, and
 3. 9. The condensed cyclic compound of claim 1, wherein Ar₃ toAr₆ are each independently selected from: groups represented by Formula2-11 to Formula 2-17, a phenyl group, a pentalenyl group, an indenylgroup, a naphthyl group, an azulenyl group, a heptalenyl group, anindacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a picenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group, and aphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, anazulenyl group, a heptalenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenylgroup, an anthracenyl group, a fluoranthenyl group, a triphenylenylgroup, a pyrenyl group, a chrysenyl group, a naphthacenyl group, apicenyl group, a perylenyl group, a pentaphenyl group, a hexacenylgroup, a pentacenyl group, a rubicenyl group, a coronenyl group, anovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anisoindolyl group, an indolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a carbazolyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group,an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup a dibenzosilolyl group, a thiadiazolyl group, an imidazopyridinylgroup, and an imidazopyrimidinyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentylgroup, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a pentalenyl group, an indenylgroup, a naphthyl group, an azulenyl group, a heptalenyl group, anindacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a picenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a thiadiazolyl group, animidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), wherein Q₃₃ to Q₃₅ are each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group.
 10. The condensed cyclic compound of claim 1, whereinAr₃ to Ar₆ are each independently selected from: groups represented byany of Formulae 2-11(1), 2-11(2), 2-12(1), 2-12(2), 2-14(1), 2-16(1),and 2-17(1), a phenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group,a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group a dibenzosilolyl group, a thiadiazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group, and aphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, anazulenyl group, a heptalenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenylgroup, an anthracenyl group, a fluoranthenyl group, a triphenylenylgroup, a pyrenyl group, a chrysenyl group, a naphthacenyl group, apicenyl group, a perylenyl group, a pentaphenyl group, a hexacenylgroup, a pentacenyl group, a rubicenyl group, a coronenyl group, anovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anisoindolyl group, an indolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a carbazolyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzoimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group,an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup a dibenzosilolyl group, a thiadiazolyl group, an imidazopyridinylgroup, and an imidazopyrimidinyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentylgroup, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a pentalenyl group, an indenylgroup, a naphthyl group, an azulenyl group, a heptalenyl group, anindacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a picenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a thiadiazolyl group, animidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅), wherein Q₃₃ to Q₃₅ are each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group:


11. The condensed cyclic compound of claim 1, wherein R₁ to R₁₂ inFormulae 2B to 2E are each independently selected from a binding site toA₁ in Formula 1, hydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, groups represented by Formulae 5-1 to 5-75, and—Si(Q₃)(Q₄)(Q₅), wherein at least one selected from R₁ to R₁₂ is abinding site to A₁ in Formula 1, and a number of binding sites is equalto n1; Ar₃ to Ar₆ in Formulae 2-2 to 2-4 are each independently selectedfrom groups represented by Formulae 2-11 to 2-17 and groups representedby Formulae 5-1 to 5-75; and R₂₁ and R₂₂ in Formulae 2-11 to 2-17 areeach independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I,a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₁₀ alkyl group, groups represented byFormulae 5-1 to 5-75, and —Si(Q₃)(Q₄)(Q₅), wherein Q₃ to Q₅ are eachindependently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group,a phenyl group, and a naphthyl group:

wherein, in Formulae 5-1 to 5-75, Y₃₁ is selected from O, S,C(Z₃₃)(Z₃₄), N(Z₃₅), and Si(Z₃₆)(Z₃₇); Z₃₁ to Z₃₇ are each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, a triazinyl group, a biphenylgroup, a terphenyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), wherein Q₃₃ to Q₃₅ areeach independently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, a phenyl group, and a naphthyl group; e2 is an integer selectedfrom 1 and 2 e3 is an integer selected from 1 to 3; e4 is an integerselected from 1 to 4; e5 is an integer selected from 1 to 5; e6 is aninteger selected from 1 to 6; e7 is an integer selected from 1 to 7; e8is an integer selected from 1 to 8; e9 is an integer selected from 1 to9; and is a binding site with an adjacent atom.
 12. The condensed cycliccompound of claim 1, wherein R₁ to R₁₂ in Formulae 2B to 2E are eachindependently selected from a binding site to A₁ in Formula 1, hydrogen,deuterium, —F, —Cl, —Br, —I, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkylgroup, groups represented by Formulae 6-1 to 6-43, groups represented byFormula 10-1 to 10-117, and —Si(Q₃)(Q₄)(Q₅), wherein at least oneselected from R₁ to R₁₂ is a binding site to A₁ in Formula 1, and anumber of binding sites is equal to n1; Ar₃ to Ar₆ in Formulae 2-2 to2-4 are each independently selected from groups represented by Formulae2-11 to 2-17, groups represented by Formulae 6-1 to 6-43, and groupsrepresented by Formulae 10-1 to 10-117; and R₂₁ and R₂₂ in Formulae 2-11to 2-17 are each independently selected from hydrogen, deuterium, —F,—Cl, —Br, —I, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₁₀ alkyl group, groups representedby Formulae 6-1 to 6-43, groups represented by Formulae 10-1 to 10-117,and —Si(Q₃)(Q₄)(Q₅), wherein Q₃ to Q₅ are each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, and anaphthyl group:

wherein, in Formulae 6-1 to 6-43 and 10-1 to 10-117, * is a binding sitewith an adjacent atom.
 13. The condensed cyclic compound of claim 1,wherein the condensed cyclic compound is represented by one of Formulae2B-1 to 2E-1:


14. The condensed cyclic compound of claim 1, wherein the condensedcyclic compound is represented by one of Formulae 1(3) to 1(8):


15. The condensed cyclic compound of claim 1, wherein X₁ is O; L₄ to L₁₀are each independently selected from: a phenylene group, a pentalenylenegroup, an indenylene group, a naphthylene group, an azulenylene group, aheptalenylene group, an indacenylene group, an acenaphthylene group, afluorenylene group, a spiro-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a naphthacenylene group, a picenylene group, a perylenylenegroup, a pentaphenylene group, a hexacenylene group, a pentacenylenegroup, a rubicenylene group, a coronenylene group, an ovalenylene group,a pyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group and an imidazopyrimidinylene group, and aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅); a4, a7, and a9 are each independently selected from1 and 2; a5, a6, a8, and a10 are each independently selected from 0, 1,and 2; R₁ to R₁₂ are each independently selected from a binding site toA₁ in Formula 1, hydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₁₀ alkyl group, groups represented by Formulae 5-1 to 5-75, and—Si(Q₃)(Q₄)(Q₅), wherein at least one selected from R₁ to R₁₂ is abinding site to A₁ in Formula 1, and a number of binding sites is equalto n1; Ar₃ to Ar₆ are each independently selected from groupsrepresented by Formulae 2-11 to 2-17, and groups represented by Formulae5-1 to 5-75; and R₂₁ and R₂₂ in Formulae 2-11 to 2-17 are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₁₀ alkyl group, groups represented byFormulae 5-1 to 5-75, and —Si(Q₃)(Q₄)(Q₅), wherein Q₃ to Q₅ and Q₃₃ toQ₃₅ are each independently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀alkoxy group, a phenyl group, and a naphthyl group:

wherein, in Formulae 5-1 to 5-75, Y₃₁ is selected from O, S,C(Z₃₃)(Z₃₄), N(Z₃₅), and Si(Z₃₆)(Z₃₇); Z₃₁ to Z₃₇ are each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, a triazinyl group, a biphenylgroup, a terphenyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), wherein Q₃₃ to Q₃₅ areeach independently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, a phenyl group, and a naphthyl group; e2 is an integer selectedfrom 1 and 2; e3 is an integer selected from 1 to 3; e4 is an integerselected from 1 to 4; e5 is an integer selected from 1 to 5; e6 is aninteger selected from 1 to 6; e7 is an integer selected from 1 to 7; e8is an integer selected from 1 to 8; e9 is an integer selected from 1 to9; and * is a binding site with an adjacent atom.
 16. An organiclight-emitting device comprising: a first electrode; a second electrodefacing the first electrode; and an organic layer between the firstelectrode and the second electrode, the organic layer comprising anemission layer, wherein the organic layer further comprises thecondensed cyclic compound of claim
 1. 17. The organic light-emittingdevice of claim 16, wherein the first electrode is an anode; the secondelectrode is a cathode; the organic layer comprises: a hole transportregion between the first electrode and the emission layer, the holetransport region comprising at least one selected from a hole injectionlayer, a hole transport layer, a buffer layer, and an electron blockinglayer, and an electron transport region between the emission layer andthe second electrode, the electron transport region comprising at leastone selected from a hole blocking layer, an electron transport layer,and an electron injection layer; and at least one selected from theemission layer and the electron transport region comprises the condensedcyclic compound.
 18. The organic light-emitting device of claim 17,wherein the electron transport region comprises an electron transportlayer, and the electron transport layer comprises the condensed cycliccompound.
 19. A condensed cyclic compound being one of Compounds 5, 7 to11, 16, and 18 to 45:


20. An organic light-emitting device comprising: a first electrode; asecond electrode facing the first electrode; and an organic layerbetween the first electrode and the second electrode, the organic layercomprising an emission layer, wherein the emission layer comprises acondensed cyclic compound represented by Formula 1:A₂-(A₁)_(n1),  Formula 1 wherein, in Formula 1, A₂ is selected fromgroups represented by Formulae 2A to 2E; A₁ is selected from groupsrepresented by Formulae 2-1 to 2-4; and n1 is an integer selected from 1to 5, wherein, when n1 is 2 or greater, at least two A₁s are the same asor different from each other:

wherein, X₁ and X₂ in Formulae 2A to 2E and Formulae 2-11 to 2-17 areeach independently O or S; R₁ to R₁₂ in Formulae 2A to 2E are eachindependently selected from a binding site to A₁ in Formula 1, hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇),wherein at least one selected from R₁ to R₁₂ is a binding site to A₁ inFormula 1, and a number of binding sites is equal to n1; L₁ to L₁₀ inFormulae 2-1 to 2-4 are each independently selected from a substitutedor unsubstituted C₃-C₁₀ cycloalkylene group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkylene group, a substituted orunsubstituted C₃-C₁₀ cycloalkenylene group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₁-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic condensed heteropolycyclic group; a1to a10 in Formulae 2-1 to 2-4 are each independently an integer selectedfrom 0 to 5; Ar₁ to Ar₆ in Formulae 2-1 to 2-4 are each independentlyselected from groups represented by Formulae 2-11 to 2-17, a substitutedor unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstitutedC₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₁-C₆₀heteroaryl group, a substituted or unsubstituted monovalent non-aromaticcondensed polycyclic group, and a substituted or unsubstitutedmonovalent non-aromatic condensed heteropolycyclic group; b1 to b4 inFormulae 2-1 to 2-4 are each independently an integer selected from 1 to5; R₂₁ and R₂₂ in Formulae 2-11 to 2-17 are each independently selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇); c1in Formulae 2-11 to 2-17 is an integer selected from 0 to 5; and c2 inFormulae 2-11 to 2-17 is an integer selected from 0 to 6, wherein atleast one substituent of the substituted C₃-C₁₀ cycloalkylene group, thesubstituted C₁-C₁₀ heterocycloalkylene group, the substituted C₃-C₁₀cycloalkenylene group, the substituted C₁-C₁₀ heterocycloalkenylenegroup, the substituted C₆-C₆₀ arylene group, the substituted C₁-C₆₀heteroarylene group, the substituted divalent non-aromatic condensedpolycyclic group, the substituted divalent non-aromatic condensedheteropolycyclic group, the substituted C₁-C₆₀ alkyl group, thesubstituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group,the substituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkylgroup, the substituted C₁-C₁₀ heterocycloalkyl group, the substitutedC₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenylgroup, the substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxygroup, the substituted C₆-C₆₀ arylthio group, the substituted C₁-C₆₀heteroaryl group, the substituted monovalent non-aromatic condensedpolycyclic group, and the substituted monovalent non-aromatic condensedheteropolycyclic group is selected from: deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, a C₁-C₆₀ alkylgroup, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀alkoxy group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, C₆-C₆₀ arylthio group, C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₁₁)(Q₁₂),—Si(Q₁₃)(Q₁₄)(Q₁₅), and —B(Q₁₆)(Q₁₇), a C₃-C₁₀ cycloalkyl group, aC₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group, each substituted with at least oneselected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), and—B(Q₂₆)(Q₂₇), and —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇),wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group.
 21. Acondensed cyclic compound represented by Formula 2A-1:

wherein X₁ is S or O; A₁ is represented by Formula 2-1; L₁ to L₃ areeach independently selected from: a pentalenylene group, an indenylenegroup, an azulenylene group, a heptalenylene group, an indacenylenegroup, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a naphthacenylene group, a picenylenegroup, a perylenylene group, a pentaphenylene group, a hexacenylenegroup, a pentacenylene group, a rubicenylene group, a coronenylenegroup, an ovalenylene group, a pyrrolylene group, a thiophenylene group,a furanylene group, an imidazolylene group, a pyrazolylene group, athiazolylene group, an isothiazolylene group, an oxazolylene group, anisoxazolylene group, a pyridinylene group, a pyrazinylene group, apyrimidinylene group, a pyridazinylene group, an isoindolylene group, anindolylene group, an indazolylene group, a purinylene group, aquinolinylene group, an isoquinolinylene group, a benzoquinolinylenegroup, a phthalazinylene group, a naphthyridinylene group, aquinoxalinylene group, a quinazolinylene group, a cinnolinylene group, acarbazolylene group, a phenanthridinylene group, an acridinylene group,a phenanthrolinylene group, a phenazinylene group, a benzoimidazolylenegroup, a benzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group and an imidazopyrimidinylene group, and aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅); a1 is selected from 1 and 2; a2 and a3 are eachindependently selected from 0, 1, and 2; R₂ to R₁₂ are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group,groups represented by Formulae 5-1 to 5-75, and —Si(Q₃)(Q₄)(Q₅); Ar₁ andAr₂ are each independently selected from groups represented by Formulae2-11 to 2-17 and groups represented by Formulae 5-1 to 5-75; R₂₁ and R₂₂in Formulae 2-11 to 2-17 are each independently selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇); c1in Formulae 2-11 to 2-17 is an integer selected from 0 to 5; c2 inFormulae 2-11 to 2-17 is an integer selected from 0 to 6; and wherein Q₃to Q₅ and Q₃₃ to Q₃₅ are each independently selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, a phenyl group, and a naphthyl group:

wherein, in Formulae 5-1 to 5-75, Y₃₁ is selected from O, S,C(Z₃₃)(Z₃₄), N(Z₃₅), and Si(Z₃₆)(Z₃₇); Z₃₁ to Z₃₇ are each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, a triazinyl group, a biphenylgroup, a terphenyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), wherein Q₃₃ to Q₃₅ areeach independently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, a phenyl group, and a naphthyl group; e3 is an integer selectedfrom 1 to 3; e4 is an integer selected from 1 to 4; e5 is an integerselected from 1 to 5; e6 is an integer selected from 1 to 6; e7 is aninteger selected from 1 to 7; e9 is an integer selected from 1 to 9;and * is a binding site with an adjacent atom.
 22. An organiclight-emitting device comprising: a first electrode; a second electrodefacing the first electrode; and an organic layer between the firstelectrode and the second electrode, the organic layer comprising anemission layer, wherein the organic layer further comprises thecondensed cyclic compound of claim
 21. 23. A condensed cyclic compoundrepresented by Formula 2A-2:

wherein X₁ is S or O; A₁ is represented by Formula 2-1; L₁ to L₃ areeach independently selected from: a phenylene group, a pentalenylenegroup, an indenylene group, a naphthylene group, an azulenylene group, aheptalenylene group, an indacenylene group, an acenaphthylene group, afluorenylene group, a spiro-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a naphthacenylene group, a picenylene group, a perylenylenegroup, a pentaphenylene group, a hexacenylene group, a pentacenylenegroup, a rubicenylene group, a coronenylene group, an ovalenylene group,a pyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group and an imidazopyrimidinylene group, and aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzoimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and—Si(Q₃₃)(Q₃₄)(Q₃₅); a1 is selected from 1 and 2; a2 and a3 are eachindependently selected from 0, 1, and 2; R₂ to R₁₂ are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group,groups represented by Formulae 5-1 to 5-75, and —Si(Q₃)(Q₄)(Q₅); Ar₁ andAr₂ are each independently selected from groups represented by Formulae2-11 to 2-17, and groups represented by Formulae 5-1 to 5-75; R₂₁ andR₂₂ in Formulae 2-11 to 2-17 are each independently selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇); c1in Formulae 2-11 to 2-17 is an integer selected from 0 to 5; c2 inFormulae 2-11 to 2-17 is an integer selected from 0 to 6; and wherein Q₃to Q₅ and Q₃₃ to Q₃₅ are each independently selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, a phenyl group, and a naphthyl group:

wherein, in Formulae 5-1 to 5-75, Y₃₁ is selected from O, S,C(Z₃₃)(Z₃₄), N(Z₃₅), and Si(Z₃₆)(Z₃₇); Z₃₁ to Z₃₇ are each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, a triazinyl group, a biphenylgroup, a terphenyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅), wherein Q₃₃ to Q₃₅ areeach independently selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, a phenyl group, and a naphthyl group; e3 is an integer selectedfrom 1 to 3; e4 is an integer selected from 1 to 4; e5 is an integerselected from 1 to 5; e6 is an integer selected from 1 to 6; e7 is aninteger selected from 1 to 7; e9 is an integer selected from 1 to 9;and * is a binding site with an adjacent atom.
 24. An organiclight-emitting device comprising: a first electrode; a second electrodefacing the first electrode; and an organic layer between the firstelectrode and the second electrode, the organic layer comprising anemission layer, wherein the organic layer further comprises thecondensed cyclic compound of claim 23.